Grain-hulling mill.



D. UHLHORN, JR. GRAIK HULLING MILL. A-PPLIOATION FILED Nov. a, 1906.

918,226. Patented Apr. 13, I909.

2 SHEETS-SHEET 1.

DIEDRIOH UHLHORN, JR, OF GREVENBROIOH, GERMANY.

GBsAIN-HULLING MILL.

Specification of Letters I-atent.

Application filed November 8, 1906.

Patented April 13, 1909.

Serial No. 342,464.

To all whom it may concern:

Be it known that I, DIEDRIOH UHLHORN, J11, a subject of the GermanEmperor, and resident of Grevenbroich, Germany, have invented new anduseful Improvements in Grain-Hulling Mills, of which the following is aspecification.

The hulling mill embodying the present invention has the object to freethe dry or moistened grain from the outer woody fiber hull, by intensefrictional contact of the berries against each other and against thework ing faces of the hulling mill.

On the accompanying drawings, Figure 1 shows a central vertical section,and Fig. 2 a plan, of the mill.

On the iron casing 1 the iron holder 2 for the to) bearing 3 is fixed byscrews into which iolder the bed-stone 4 is fitted. The runner 5 is alsofixed in an iron holder 6 which is keyed on the mill shaft 7. The latteris supported in the top bearing 3 and in the bottom bearing 8 which isada ted to be raised or lowered by means of t e hoisting device 9 andguided in the socket 10.

The runner 5 is, by means of the hoisting device 9, so adjusted that thedistance between the working faces of the millstones is somewhat largerthan the greatest length of the grain.

The grain to be hulled which is filled in the mill by one of the knownmill hoppers, falls through the opening 11 onto the rotating runner 5and is forced by the centrifugal force between the roughened hullingfaces of the two millstones, whereby the berries come in such intensefrictional contact with each other and with the working faces of themill that the woody fiber hull is entirely or partly strip ed offaccording to whether the grain was i led in the mill in a moistened ordry condition.

The adjustable ring 12 serves for preventing the grain from leaving themill too quickly. The ring 12 is riveted on five screws 13 of which thenuts, forming small chain wheels 14, are mounted on the upper holder 2and in the members 15 bywhioh they are prevented from axial motion.

Around the five small chain wheels 14 an endless chain 16 is placed. Byturning the hand wheel 17 which is keyed on the extended boss of one ofthe small chain wheels 14, the ring 12 can be uniformly raised orlowered.

The diameter of runner 5, exceeds that of bed-stone 4, so that anannular portion of the former is exposed around the latter. The ring 12encircles the bed-stone 4c, and is thus arranged above this exposed partof the upper working surface of runner 5, the latter extending laterallybeyond the outer edge of the ring. In this way a circular graindischarge slot is formed between the ring and the working surface of therunner, the height of which is less than the distance between theworking surfaces of runner and bed-st0ne. By means of this construction,the ring, while regulating the discharge of the grain, will not changeits direction of travel, and will thus offer an unobstructed dischargeopening for the hulled grain.

Between the bottom bearings 8 and the hoisting device 9, rubber bufiers18 (or also a spiral spring of steel) are inserted in order to becompressed when the pressure between the working faces of the millbecomes too high and the runner is somewhat lowered, by whichcompression the outgo of the grain is considerably facilitated.

By turning the nut 19 and fixing the same by the counternut 20, therubber bufiers 18 are tensioned to the pressure necessary for thehulling action. By the baffle plates 21 the grain hulled is forcedthrough the outlet 22 out of the mill, and is then separated from thehulls in the known manner.

Having fully described my invention what I claim and desire to secure byLetters Patent is In a grain hulling mill, a casing, a bedstone securedthereto and having a lower working surface, a shaft rotatably supportedin the casing, a runner keyed to the shaft below the bed-stone andhaving an upper working surface, the diameter of the runner exceedingthat of the bed-stone, and an adjustable ring which encircles the bedstone, projects below the working surface thereof and faces the workingsurface of the runner, to form a circular discharge slot between ringand upper runnersurface, the height of which is less than the distancebetween the working surface of bed-stone and runner, substantially asspecified.

Signed by me at Dusseldorf, Germany this nineteenth day of October 1906.

DIEDRICH UHLHORN, JR.

VVitnesses ALFR. FOHLMEYER, M. ENGELS.

